<?php
//文件类型
return [
    'img' => ['image/png', 'image/jpeg', 'image/gif', 'image/webp'],
    'audio' => ['audio/mpeg', 'audio/x-hx-aac-adts'],
    'video' => ['video/mp4', 'video/quicktime'],
    'pdf' => ['application/pdf'],
    'word' => ['application/vnd.openxmlformats-officedocument.wordprocessingml.document'],
    'excel' => ['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'],
];
